Maths: Key Equations Flashcards
1
Q
What is the equation for the area of a trapezium?
A
1/2(a + b - sum of parallel sides) x height
2
Q
What is the equation for the area of a circle?
A
pir^2
3
Q
What is the equation for the circumference of a circle?
A
pieD or 2pir
4
Q
SOH CAH TOA
A
sin = o/h cah = a / h toa = o/a
5
Q
Quadratic formula
A
-b +- square root of(b^2 - 4ac) / 2a
6
Q
What is completed square form?
A
(x + a)^2 + b —> a is half of bx and b is c - a^2
7
Q
What are the laws of indices?
A
x^a * x^b = x^a+b
x^a / x^b = x^a - b
(x^a)^b = x^ab
8
Q
1m = ?cm
A
1m = 100cm
9
Q
1m^2 = ?cm^2
A
1m^2 = 10000cm^2
10
Q
1m^3 = ?cm^3
A
1m^3 = 1000000cm^3
11
Q
What is pythagoras theorem?
A
a^2 + b^2 = c^2
12
Q
What is the quadratic equation?
A
ax^2 + bx + c = 0
13
Q
Area of a rectangle?
A
l x w
14
Q
Area of a parallelogram?
A
b x h
15
Q
Area of a triangle?
A
1/2b x h
